package com.starry.security.filter;

import com.starry.security.security.TokenManager;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.web.AuthenticationEntryPoint;
import org.springframework.security.web.authentication.www.BasicAuthenticationFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
//认证过滤器
public class TokenAuthFilter extends BasicAuthenticationFilter {
	private TokenManager tokenManager;
	private RedisTemplate redisTemplate;

	public TokenAuthFilter(AuthenticationManager authenticationManager, TokenManager tokenManager, RedisTemplate redisTemplate) {
		super(authenticationManager);
		this.tokenManager = tokenManager;
		this.redisTemplate = redisTemplate;
	}

	@Override
	protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain) throws IOException, ServletException {
		//获取当前认证成功用户权限信息
		UsernamePasswordAuthenticationToken authRequest = getAuthentication(request);
		//判断 如果有权限信息 放到权限上下文中
		if (authRequest != null) {
			SecurityContextHolder.getContext().setAuthentication(authRequest);
		}
		chain.doFilter(request, response);
	}

	private UsernamePasswordAuthenticationToken getAuthentication(HttpServletRequest request) {
		String token = request.getHeader("token");
		if (token != null) {
			String username = tokenManager.getUserInfoFromToken(token);
			//获取权限列表
			List<String> permissionValueList = (List<String>) redisTemplate.opsForValue().get(username);
			Collection<GrantedAuthority> authorities = new ArrayList<>();
			for (String permission : permissionValueList) {
				SimpleGrantedAuthority authority = new SimpleGrantedAuthority(permission);
				authorities.add(authority);
			}
			return new UsernamePasswordAuthenticationToken(username, token, authorities);
		}
		return null;
	}
}
